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Turning and boring almost any* shape. *within reason

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sam sokolik22/10/2020 15:59:05
81 forum posts

Some more fun with cnc...

Michael Gilligan22/10/2020 22:39:22
20183 forum posts
1053 photos

Clever stuff, Sam yes

Keep sharing your adventure


DC31k23/10/2020 08:27:59
686 forum posts
2 photos

A couple of questions:

Right now, it is effectively converting a closed shape into a series of (X, A) coordinate values, where I guess the A- increment can be arbitrarily small.

How easy would it be to make it turn 90 degrees and produce (Z, A) values? I am thinking of a face cam, as used in Brierley and Rush drill grinders.

Second, does it have any built-in idiot-proofing? If I sent it a circular hole with a keyway cut out, would it tell me to go away and pound sand due to the discontinuity in the profile? As a corollary to this, what is the most acute internal angle with which it is comfortable (e.g. an equilateral triangle-shaped bore)?


Nigel Graham 223/10/2020 09:04:43
2133 forum posts
29 photos

I'm not an expert on CNC machining but I don't think the keyhole would be a problem unless the corner radii are very critical . Rather, won't the minima on milling internal dimensions including angles, be controlled by practical machining criteria like the diameter and lengths of the cutters, more than the tool paths?

I recall seeing a drawing at work of something resembling the internal profile of a hollowed stepped pulley, in which one of the steps was shown with a small pocket, perhaps for a form of key, milled into it. The pocket's size and 2mm corner radii were so small, and it was so far down the overall cavity, I could not imagine how it could be machined with any standard slot-drills.

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